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          LV17-01-输入类设备-05-触摸屏tslib开源库-01-简介与移植
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    <div class="post-body" itemprop="articleBody"><p>本文主要是输入类设备控制——触摸屏tslib开源库的简介与移植的相关笔记，若笔记中有错误或者不合适的地方，欢迎批评指正😃。</p>
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<details class="folding-tag" blue><summary> 点击查看使用工具及版本 </summary>
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              <table>    <tr>        <td align="center" rowspan="5">PC端开发环境</td>        <td align="center" width=150px>Windows</td>        <td align="left">Windows11</td>    </tr>    <tr>        <td align="center">Ubuntu</td>        <td align="left">Ubuntu20.04.2的64位版本</td>      </tr>    <tr>        <td align="center">VMware® Workstation 17 Pro</td>        <td align="left">17.6.0 build-24238078</td>      </tr>    <tr>        <td align="center">终端软件</td>        <td align="left">MobaXterm(Professional Edition v23.0 Build 5042 (license))</td>    </tr>    <tr>        <td align="center">Win32DiskImager</td>        <td align="left">Win32DiskImager v1.0</td>      </tr>    <tr>        <td align="center" rowspan="3">Linux开发板环境</td>        <td align="center">Linux开发板</td>        <td align="left">正点原子 i.MX6ULL Linux 阿尔法开发板</td>      </tr>    <tr>        <td align="center">uboot</td>        <td align="left">NXP官方提供的uboot，NXP提供的版本为uboot-imx-rel_imx_4.1.15_2.1.0_ga(使用的uboot版本为U-Boot 2016.03)</td>      </tr>    <tr>        <td align="center">linux内核</td>        <td align="left">linux-4.15(NXP官方提供)</td>      </tr></table>
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<details class="folding-tag" blue><summary> 点击查看本文参考资料 </summary>
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              <table>    <tr>        <td align="center">分类</td>        <td align="center">网址</td>        <td align="center">说明</td>    </tr>    <tr>        <td align="center" rowspan="5">官方网站</td>        <td align="left"><a href="https://www.arm.com/" target="_blank">https://www.arm.com/</a></td>        <td align="left">ARM官方网站，在这里我们可以找到Cotex-Mx以及ARMVx的一些文档</td>    </tr>    <tr>        <td align="left"><a href="https://www.nxp.com.cn/" target="_blank">https://www.nxp.com.cn/ </a></td>        <td align="left">NXP官方网站</td>    </tr>    <tr>        <td align="left"><a href="https://www.nxpic.org.cn/" target="_blank">https://www.nxpic.org.cn/</a></td><td align="left">NXP 官方社区</td>    </tr>    <tr>        <td align="left"><a href="https://u-boot.readthedocs.io/en/latest/" target="_blank">https://u-boot.readthedocs.io/en/latest/</a></td><td align="left">u-boot官网</td>    </tr>    <tr>        <td align="left"><a href="https://www.kernel.org/" target="_blank">https://www.kernel.org/</a></td><td align="left">linux内核官网</td>    </tr>    <tr>        <td align="center" rowspan="5">其他网站</td>        <td align="left"><a href="https://elixir.bootlin.com/linux/v4.15/source/kernel" target="_blank">kernel - Linux source code (v4.15) - Bootlin</a></td>        <td align="left">linux内核源码在线查看</td>    </tr></table>
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<details class="folding-tag" blue><summary> 点击查看相关文件下载 </summary>
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              <table>    <tr>        <td align="center">分类</td>        <td align="center">网址</td>        <td align="center">说明</td>    </tr>    <tr>        <td align="center" rowspan="4">NXP</td>        <td align="left"><a href="https://github.com/nxp-imx" target="_blank">https://github.com/nxp-imx</a></td>        <td align="left">NXP imx开发资源GitHub组织，里边会有u-boot和linux内核的仓库</td>    </tr>    <tr>        <td align="left"><a href="https://elixir.bootlin.com/linux/latest/source" target="_blank">https://elixir.bootlin.com/linux/latest/source</a></td>        <td align="left">在线阅读linux kernel源码</td>    </tr>    <tr>        <td align="left"><a href="https://github.com/nxp-imx/linux-imx/releases/tag/rel_imx_4.1.15_2.1.0_ga" target="_blank">nxp-imx/linux-imx/releases/tag/rel_imx_4.1.15_2.1.0_ga</a></td>        <td align="left">NXP linux内核仓库tags中的rel_imx_4.1.15_2.1.0_ga</td>    </tr>    <tr>        <td align="left"><a href="https://github.com/nxp-imx/uboot-imx/releases/tag/rel_imx_4.1.15_2.1.0_ga" target="_blank">nxp-imx/uboot-imx/releases/tag/rel_imx_4.1.15_2.1.0_ga</a></td>        <td align="left">NXP u-boot仓库tags中的rel_imx_4.1.15_2.1.0_ga</td>    </tr>    <tr>        <td align="center" rowspan="2">I.MX6ULL</td>        <td align="left"><a href="https://www.nxp.com.cn/docs/en/data-sheet/IMX6ULLIEC.pdf" target="_blank">i.MX 6ULL Applications Processors for Industrial Products</a></td>        <td align="left">I.MX6ULL 芯片手册（datasheet，可以在线查看）</td>    </tr>    <tr>        <td align="left"><a href="https://www.nxp.com.cn/webapp/Download?colCode=IMX6ULLRM&lang_cd=zh" target="_blank">i.MX 6ULL Applications ProcessorReference Manual</a></td>        <td align="left">I.MX6ULL 参考手册（下载后才能查看，需要登录NXP官网）</td>    </tr></table>
              </div>
            </details>

<h1 id="一、tslib-是什么"><a href="#一、tslib-是什么" class="headerlink" title="一、tslib 是什么"></a><font size=3>一、tslib 是什么</font></h1><img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV17-01-%E8%BE%93%E5%85%A5%E7%B1%BB%E8%AE%BE%E5%A4%87-05-%E8%A7%A6%E6%91%B8%E5%B1%8Ftslib%E5%BC%80%E6%BA%90%E5%BA%93-01-%E7%AE%80%E4%BB%8B%E4%B8%8E%E7%A7%BB%E6%A4%8D/img/image-20240922134849466.png" alt="image-20240922134849466" style="zoom:50%;" />

<p>官网在这里：<a target="_blank" rel="noopener" href="http://www.tslib.org/">tslib</a>，打开后就是上面的图片：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV17-01-%E8%BE%93%E5%85%A5%E7%B1%BB%E8%AE%BE%E5%A4%87-05-%E8%A7%A6%E6%91%B8%E5%B1%8Ftslib%E5%BC%80%E6%BA%90%E5%BA%93-01-%E7%AE%80%E4%BB%8B%E4%B8%8E%E7%A7%BB%E6%A4%8D/img/image-20240922134918836.png" alt="image-20240922134918836" style="zoom:50%;" />

<p>tslib 是专门为触摸屏设备所开发的 Linux 应用层函数库，并且是开源，也就意味着我们可以直接获取到<br>tslib 的源代码 。</p>
<p>tslib 为触摸屏驱动和应用层之间的适配层， 它把应用程序中读取触摸屏 struct input_event 类型数据（这是输入设备上报给应用层的原始数据）并进行解析的操作过程进行了封装，向使用者提供了封装好的 API 接口。 </p>
<p>tslib 从触摸屏中获得原始的坐标数据， 并通过一系列的去噪、去抖、坐标变换等操作，来去除噪声并将<br>原始的触摸屏坐标转换为相应的屏幕坐标。  </p>
<p>tslib 有一个配置文件 ts.conf， 该配置文件中提供了一些配置参数、用户可以对其进行修改 ，后面会详细进行学习。</p>
<p>tslib 可以作为 Qt 的触摸屏输入插件，为 Qt 提供触摸输入支持， 如果在嵌入式 Linux 硬件平台下开发过Qt 应用程序的话应该知道；当然，并不是只有 tslib 才能作为 Qt 的插件、为其提供触摸输入支持，还有很多插件都可以，只不过大部分都会选择使用 tslib。  </p>
<h1 id="二、tslib-移植"><a href="#二、tslib-移植" class="headerlink" title="二、tslib 移植  "></a><font size=3>二、tslib 移植  </font></h1><h2 id="1-下载源码"><a href="#1-下载源码" class="headerlink" title="1. 下载源码"></a><font size=3>1. 下载源码</font></h2><p>首先下载 tslib 源码包，进入到 tslib 的 git 仓库下载源码 ：<a target="_blank" rel="noopener" href="https://github.com/libts/tslib/releases">Releases · libts&#x2F;tslib (github.com)</a>：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV17-01-%E8%BE%93%E5%85%A5%E7%B1%BB%E8%AE%BE%E5%A4%87-05-%E8%A7%A6%E6%91%B8%E5%B1%8Ftslib%E5%BC%80%E6%BA%90%E5%BA%93-01-%E7%AE%80%E4%BB%8B%E4%B8%8E%E7%A7%BB%E6%A4%8D/img/image-20240922135305189.png" alt="image-20240922135305189" />

<p>ALPHA 开发板出厂系统中已经移植了 tslib，并且版本为 1.16，可以在开发板执行 ts_finddev 命令查看到它的版本信息，如下所示：  </p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV17-01-%E8%BE%93%E5%85%A5%E7%B1%BB%E8%AE%BE%E5%A4%87-05-%E8%A7%A6%E6%91%B8%E5%B1%8Ftslib%E5%BC%80%E6%BA%90%E5%BA%93-01-%E7%AE%80%E4%BB%8B%E4%B8%8E%E7%A7%BB%E6%A4%8D/img/image-20240922212505883.png" alt="image-20240922212505883" style="zoom:50%;" />

<p>所以为了统一，我们也下载 1.16 版本的 tslib，往下翻找到 1.16 版本的下载链接：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV17-01-%E8%BE%93%E5%85%A5%E7%B1%BB%E8%AE%BE%E5%A4%87-05-%E8%A7%A6%E6%91%B8%E5%B1%8Ftslib%E5%BC%80%E6%BA%90%E5%BA%93-01-%E7%AE%80%E4%BB%8B%E4%B8%8E%E7%A7%BB%E6%A4%8D/img/image-20240922135427001.png" alt="image-20240922135427001" style="zoom:50%;" />

<p>我们点击 <a target="_blank" rel="noopener" href="https://github.com/libts/tslib/releases/tag/1.16">Release tslib 1.16 · libts&#x2F;tslib (github.com)</a> 进去：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV17-01-%E8%BE%93%E5%85%A5%E7%B1%BB%E8%AE%BE%E5%A4%87-05-%E8%A7%A6%E6%91%B8%E5%B1%8Ftslib%E5%BC%80%E6%BA%90%E5%BA%93-01-%E7%AE%80%E4%BB%8B%E4%B8%8E%E7%A7%BB%E6%A4%8D/img/image-20240922135643223.png" alt="image-20240922135643223" style="zoom:50%;" />

<p>下载 tar.bz2 或 tar.gz 格式压缩包，或者 tar.xz 压缩包，这里我下载 tar.gz 格式的压缩包文件，点<br>击文字即可下载。下载好后我们解压一下：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV17-01-%E8%BE%93%E5%85%A5%E7%B1%BB%E8%AE%BE%E5%A4%87-05-%E8%A7%A6%E6%91%B8%E5%B1%8Ftslib%E5%BC%80%E6%BA%90%E5%BA%93-01-%E7%AE%80%E4%BB%8B%E4%B8%8E%E7%A7%BB%E6%A4%8D/img/image-20240922142701069.png" alt="image-20240922142701069" style="zoom:50%;" />

<p>解压后有上图这些文件。</p>
<h2 id="2-编译源码"><a href="#2-编译源码" class="headerlink" title="2. 编译源码"></a><font size=3>2. 编译源码</font></h2><ul>
<li>（1）创建安装目录</li>
</ul>
<p>我们创建一个out目录作为编译成果物存放的位置：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">cd ~/8linux_lib/tslib-1.16/</span><br><span class="line">mkdir out</span><br></pre></td></tr></table></figure>

<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV17-01-%E8%BE%93%E5%85%A5%E7%B1%BB%E8%AE%BE%E5%A4%87-05-%E8%A7%A6%E6%91%B8%E5%B1%8Ftslib%E5%BC%80%E6%BA%90%E5%BA%93-01-%E7%AE%80%E4%BB%8B%E4%B8%8E%E7%A7%BB%E6%A4%8D/img/image-20240922143031420.png" alt="image-20240922143031420" style="zoom:50%;" />

<ul>
<li>（2）配置工程</li>
</ul>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">./configure --host=arm-linux-gnueabihf --prefix=/home/sumu/8linux_lib/tslib-1.16/out</span><br></pre></td></tr></table></figure>

<p>至于工程是如何配置的，可以执行.&#x2F;configure –help 查看它的配置选项以及含义。</p>
<p> –host 选项用于指定交叉编译得到的库文件是运行在哪个平台，通常将–host 设置为交叉编译器名称的前缀，如 arm-linux-gnueabihf-gcc 前缀就是 arm-linux-gnueabihf；</p>
<p> –prefix 选项则用于指定库文件的安装路径，我们将安装路径设置为之前创建的&#x2F;home&#x2F;sumu&#x2F;8linux_lib&#x2F;tslib-1.16&#x2F;out 目录。  </p>
<p>配置完成后如下图所示：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV17-01-%E8%BE%93%E5%85%A5%E7%B1%BB%E8%AE%BE%E5%A4%87-05-%E8%A7%A6%E6%91%B8%E5%B1%8Ftslib%E5%BC%80%E6%BA%90%E5%BA%93-01-%E7%AE%80%E4%BB%8B%E4%B8%8E%E7%A7%BB%E6%A4%8D/img/image-20240922143858249.png" alt="image-20240922143858249" style="zoom: 50%;" />

<ul>
<li>（3）编译工程</li>
</ul>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">make</span><br></pre></td></tr></table></figure>

<p>编译完毕之后如下图所示：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV17-01-%E8%BE%93%E5%85%A5%E7%B1%BB%E8%AE%BE%E5%A4%87-05-%E8%A7%A6%E6%91%B8%E5%B1%8Ftslib%E5%BC%80%E6%BA%90%E5%BA%93-01-%E7%AE%80%E4%BB%8B%E4%B8%8E%E7%A7%BB%E6%A4%8D/img/image-20240922144233300.png" alt="image-20240922144233300" style="zoom:50%;" />

<ul>
<li>（4）安装</li>
</ul>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">make install</span><br></pre></td></tr></table></figure>

<p>安装完毕之后如下所示：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV17-01-%E8%BE%93%E5%85%A5%E7%B1%BB%E8%AE%BE%E5%A4%87-05-%E8%A7%A6%E6%91%B8%E5%B1%8Ftslib%E5%BC%80%E6%BA%90%E5%BA%93-01-%E7%AE%80%E4%BB%8B%E4%B8%8E%E7%A7%BB%E6%A4%8D/img/image-20240922144409400.png" alt="image-20240922144409400" style="zoom:50%;" />

<p>这样out目录下就是我们的成果物了。</p>
<h2 id="3-移植到开发板"><a href="#3-移植到开发板" class="headerlink" title="3. 移植到开发板"></a><font size=3>3. 移植到开发板</font></h2><p>移植的最后一步就是把 tslib 安装目录下的库文件、 etc 下的配置文件以及编译得到的测试工具拷贝到开发板 Linux 系统目录下。</p>
<ul>
<li><p>（1）将安装目录 bin&#x2F;目录下的所有可执行文件拷贝到开发板&#x2F;usr&#x2F;bin 目录下</p>
</li>
<li><p>（2）将安装目录 etc&#x2F;目录下的配置文件 ts.conf 拷贝到开发板&#x2F;etc 目录下；</p>
</li>
<li><p>（3）将安装目录 lib&#x2F;目录下的所有库文件拷贝到开发板&#x2F;usr&#x2F;lib 目录下</p>
</li>
</ul>
<p>将安装目录下的测试工具、库文件以及配置文件拷贝到开发板之后，接着需要配置一些环境变量，因为<br>tslib 工作的时候它需要依赖于一些环境变量，例如它会通过读取环境变量来得知 ts.conf 配置文件、库文件<br>的路径以及我们要测试的触摸屏对应的设备节点等。  </p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta prompt_"># </span><span class="language-bash">TSLIB_CONSOLEDEVICE 用于配置控制台设备文件名，直接配置为 none 即可</span></span><br><span class="line">export TSLIB_CONSOLEDEVICE=none</span><br><span class="line"><span class="meta prompt_"></span></span><br><span class="line"><span class="meta prompt_"># </span><span class="language-bash">TSLIB_FBDEVICE 用于配置显示设备的名称， tslib 提供了手指触摸画线的测试工具，需要在 LCD 上显示，所以这里需要指定一个显示设备的设备节点。</span></span><br><span class="line">export TSLIB_FBDEVICE=/dev/fb0</span><br><span class="line"><span class="meta prompt_"></span></span><br><span class="line"><span class="meta prompt_"># </span><span class="language-bash">TSLIB_TSDEVICE 用于配置触摸屏对应的设备节点，根据实际情况配置。</span></span><br><span class="line">export TSLIB_TSDEVICE=/dev/input/event1</span><br><span class="line"><span class="meta prompt_"></span></span><br><span class="line"><span class="meta prompt_"># </span><span class="language-bash">TSLIB_CONFFILE 用于配置 ts.conf 文件的所在路径。</span></span><br><span class="line">export TSLIB_CONFFILE=/etc/ts.conf</span><br><span class="line"><span class="meta prompt_"></span></span><br><span class="line"><span class="meta prompt_"># </span><span class="language-bash">TSLIB_PLUGINDIR用于配置插件所在路径。</span></span><br><span class="line">export TSLIB_PLUGINDIR=/usr/lib/ts</span><br></pre></td></tr></table></figure>

<p>如果想每次启动系统都能生效，可以把这些命令放置在&#x2F;etc&#x2F;profile 脚本中执行；出厂系统中已经配置好<br>了，无需进行配置。  </p>
<h1 id="三、编译输出目录简介"><a href="#三、编译输出目录简介" class="headerlink" title="三、编译输出目录简介"></a><font size=3>三、编译输出目录简介</font></h1><p>我们前面编译安装后，输出目录有以下文件：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV17-01-%E8%BE%93%E5%85%A5%E7%B1%BB%E8%AE%BE%E5%A4%87-05-%E8%A7%A6%E6%91%B8%E5%B1%8Ftslib%E5%BC%80%E6%BA%90%E5%BA%93-01-%E7%AE%80%E4%BB%8B%E4%B8%8E%E7%A7%BB%E6%A4%8D/img/image-20240922145037170.png" alt="image-20240922145037170" style="zoom:50%;" />

<p>二级目录有以下文件：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br></pre></td><td class="code"><pre><span class="line">sumu@sumu-virtual-machine:~/8linux_lib/tslib-1.16/out$ tree -L 2</span><br><span class="line">.</span><br><span class="line">├── bin</span><br><span class="line">│   ├── ts_calibrate</span><br><span class="line">│   ├── ts_finddev</span><br><span class="line">│   ├── ts_harvest</span><br><span class="line">│   ├── ts_print</span><br><span class="line">│   ├── ts_print_mt</span><br><span class="line">│   ├── ts_print_raw</span><br><span class="line">│   ├── ts_test</span><br><span class="line">│   ├── ts_test_mt</span><br><span class="line">│   ├── ts_uinput</span><br><span class="line">│   └── ts_verify</span><br><span class="line">├── etc</span><br><span class="line">│   └── ts.conf</span><br><span class="line">├── include</span><br><span class="line">│   └── tslib.h</span><br><span class="line">├── lib</span><br><span class="line">│   ├── libts.la</span><br><span class="line">│   ├── libts.so -&gt; libts.so.0.9.1</span><br><span class="line">│   ├── libts.so.0 -&gt; libts.so.0.9.1</span><br><span class="line">│   ├── libts.so.0.9.1</span><br><span class="line">│   ├── pkgconfig</span><br><span class="line">│   └── ts</span><br><span class="line">└── share</span><br><span class="line">    └── man</span><br><span class="line">​</span><br><span class="line">8 directories, 16 files</span><br></pre></td></tr></table></figure>

<h2 id="1-bin"><a href="#1-bin" class="headerlink" title="1. bin"></a><font size=3>1. bin</font></h2><p>bin 目录下有一些 tslib 提供的小工具，可以用于测试触摸屏，如下所示：  </p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV17-01-%E8%BE%93%E5%85%A5%E7%B1%BB%E8%AE%BE%E5%A4%87-05-%E8%A7%A6%E6%91%B8%E5%B1%8Ftslib%E5%BC%80%E6%BA%90%E5%BA%93-01-%E7%AE%80%E4%BB%8B%E4%B8%8E%E7%A7%BB%E6%A4%8D/img/image-20240922145133361.png" alt="image-20240922145133361" style="zoom:50%;" />

<p>这些测试工具的源码实现，可以在 tslib 源码中找到，具体路径为 tslib 源码目录下的 tests 文件夹中：  </p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV17-01-%E8%BE%93%E5%85%A5%E7%B1%BB%E8%AE%BE%E5%A4%87-05-%E8%A7%A6%E6%91%B8%E5%B1%8Ftslib%E5%BC%80%E6%BA%90%E5%BA%93-01-%E7%AE%80%E4%BB%8B%E4%B8%8E%E7%A7%BB%E6%A4%8D/img/image-20240922152223567.png" alt="image-20240922152223567" style="zoom:50%;" />

<h2 id="2-etc"><a href="#2-etc" class="headerlink" title="2. etc   "></a><font size=3>2. etc   </font></h2><p>etc 目录下有一个配置文件 ts.conf ：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV17-01-%E8%BE%93%E5%85%A5%E7%B1%BB%E8%AE%BE%E5%A4%87-05-%E8%A7%A6%E6%91%B8%E5%B1%8Ftslib%E5%BC%80%E6%BA%90%E5%BA%93-01-%E7%AE%80%E4%BB%8B%E4%B8%8E%E7%A7%BB%E6%A4%8D/img/image-20240922145329398.png" alt="image-20240922145329398" style="zoom:50%;" />

<p>我们打开 ts.conf 文件看看它有哪些配置选项  </p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV17-01-%E8%BE%93%E5%85%A5%E7%B1%BB%E8%AE%BE%E5%A4%87-05-%E8%A7%A6%E6%91%B8%E5%B1%8Ftslib%E5%BC%80%E6%BA%90%E5%BA%93-01-%E7%AE%80%E4%BB%8B%E4%B8%8E%E7%A7%BB%E6%A4%8D/img/image-20240922145612853.png" alt="image-20240922145612853" style="zoom:50%;" />

<p>module_raw input：取消注释，使能支持 input 输入事件；</p>
<p>module pthres pmin&#x3D;1：如果我们的设备支持按压力大小测试，那么可以把它的注释取消， pmin 用于调节按压力灵敏度，默认就是等于 1。</p>
<p>module dejitter delta&#x3D;100： tslib 提供了触摸屏去噪算法插件，如果需要过滤噪声样本， 取消注释，默认参数 delta&#x3D;100。</p>
<p>module linear： tslib 提供了触摸屏坐标变换的功能，如将 X、 Y 坐标互换、坐标旋转等之类，如果我们需要实现坐标变换，可以把注释去掉。</p>
<h2 id="3-include"><a href="#3-include" class="headerlink" title="3. include   "></a><font size=3>3. include   </font></h2><p>include 目录下只有一个头文件 tslib.h，该头文件中包含了一些结构体数据结构以及 API 接口的申明，<br>使用 tslib 提供的 API 就需要包含该头文件。  </p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV17-01-%E8%BE%93%E5%85%A5%E7%B1%BB%E8%AE%BE%E5%A4%87-05-%E8%A7%A6%E6%91%B8%E5%B1%8Ftslib%E5%BC%80%E6%BA%90%E5%BA%93-01-%E7%AE%80%E4%BB%8B%E4%B8%8E%E7%A7%BB%E6%A4%8D/img/image-20240922145753985.png" alt="image-20240922145753985" style="zoom:50%;" />

<h2 id="4-lib"><a href="#4-lib" class="headerlink" title="4. lib  "></a><font size=3>4. lib  </font></h2><p>lib 目录下包含了编译 tslib 源码所得到的库文件，默认这些都是动态库文件，也可以通过配置 tslib 工程<br>使其生成静态库文件。lib&#x2F;ts 目录下存放的是一些插件库。  </p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV17-01-%E8%BE%93%E5%85%A5%E7%B1%BB%E8%AE%BE%E5%A4%87-05-%E8%A7%A6%E6%91%B8%E5%B1%8Ftslib%E5%BC%80%E6%BA%90%E5%BA%93-01-%E7%AE%80%E4%BB%8B%E4%B8%8E%E7%A7%BB%E6%A4%8D/img/image-20240922145859293.png" alt="image-20240922145859293" style="zoom:50%;" />

<h2 id="5-share"><a href="#5-share" class="headerlink" title="5. share  "></a><font size=3>5. share  </font></h2><img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV17-01-%E8%BE%93%E5%85%A5%E7%B1%BB%E8%AE%BE%E5%A4%87-05-%E8%A7%A6%E6%91%B8%E5%B1%8Ftslib%E5%BC%80%E6%BA%90%E5%BA%93-01-%E7%AE%80%E4%BB%8B%E4%B8%8E%E7%A7%BB%E6%A4%8D/img/image-20240922150034235.png" alt="image-20240922150034235" style="zoom:50%;" />

<p>没去了解，可以忽略。</p>
<h1 id="四、tslib-框架分析"><a href="#四、tslib-框架分析" class="headerlink" title="四、tslib 框架分析  "></a><font size=3>四、tslib 框架分析  </font></h1><p>tslib 的主要代码如图 ：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV17-01-%E8%BE%93%E5%85%A5%E7%B1%BB%E8%AE%BE%E5%A4%87-05-%E8%A7%A6%E6%91%B8%E5%B1%8Ftslib%E5%BC%80%E6%BA%90%E5%BA%93-01-%E7%AE%80%E4%BB%8B%E4%B8%8E%E7%A7%BB%E6%A4%8D/img/image-20241020110116880.png" alt="image-20241020110116880" style="zoom:50%;" />

<p>核心在于“plugins”目录里的“插件”，或称为“ module”。这个目录下的每个文件都是一个 module，每个 module 都提供 2 个函数： read、 read_mt，前者用于读取单点触摸屏的数据，后者用于读取多点触摸屏的数据。  </p>
<p>要分析 tslib 的框架，先看看示例程序怎么使用，我们参考 ts_test.c 和ts_test_mt.c，前者用于一般触摸屏(比如电阻屏、单点电容屏)，后者用于多点触摸屏。  </p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV17-01-%E8%BE%93%E5%85%A5%E7%B1%BB%E8%AE%BE%E5%A4%87-05-%E8%A7%A6%E6%91%B8%E5%B1%8Ftslib%E5%BC%80%E6%BA%90%E5%BA%93-01-%E7%AE%80%E4%BB%8B%E4%B8%8E%E7%A7%BB%E6%A4%8D/img/image-20241020111817124.png" alt="image-20241020111817124" />

<p>调用 ts_open 后，可以打开某个设备节点，构造出一个 tsdev 结构体。然后调用 ts_config 读取配置文件的处理，假设&#x2F;etc&#x2F;ts.conf 内容如下：  </p>
<figure class="highlight txt"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">module_raw input</span><br><span class="line">module pthres pmin=1</span><br><span class="line">module dejitter delta=100</span><br><span class="line">module linear</span><br></pre></td></tr></table></figure>

<p>每行表示一个“ module”或“ moduel_raw”。对于所有的“module”，都会插入 tsdev.list 链表头，也就是 tsdev.list执行配置文件中最后一个“ module”，配置文件中第一个“ module”位于链表的尾部。  </p>
<p>对于所有的“ module_raw”，都会插入 tsdev.list_raw 链表头，一般只有一个“ module_raw”。  </p>
<p>注意： tsdev.list 中最后一个“ module”会指向 ts_dev.list_raw 的头部。无论是调用 ts_read 还是 ts_read_mt，都是通过 tsdev.list 中的模块来处理数据的。这写模块是递归调用的，比如 linear 模块的 read 函数如图  ：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV17-01-%E8%BE%93%E5%85%A5%E7%B1%BB%E8%AE%BE%E5%A4%87-05-%E8%A7%A6%E6%91%B8%E5%B1%8Ftslib%E5%BC%80%E6%BA%90%E5%BA%93-01-%E7%AE%80%E4%BB%8B%E4%B8%8E%E7%A7%BB%E6%A4%8D/img/image-20241020112027351.png" alt="image-20241020112027351" style="zoom:80%;" />

<p>linear 模块的 read_raw 函数如图 ：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV17-01-%E8%BE%93%E5%85%A5%E7%B1%BB%E8%AE%BE%E5%A4%87-05-%E8%A7%A6%E6%91%B8%E5%B1%8Ftslib%E5%BC%80%E6%BA%90%E5%BA%93-01-%E7%AE%80%E4%BB%8B%E4%B8%8E%E7%A7%BB%E6%A4%8D/img/image-20241020112137099.png" alt="image-20241020112137099" style="zoom:80%;" />

<p>因为是递归调用，所有最先使用 input 模块读取设备节点得到原始数据，再依次经过 pthres 模块、 dejitter 模块、 linear 模块处理后，才返回最终数据。  </p>

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